代做MATH 237 Online Calculus 3 for Honours Mathematics Spring 2024 Mini-midterm 3代做留学生SQL 程序
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Spring 2024
Mini-midterm 3
Due date: 11:30pm, July 19 2024
1.(30 points) Use the method of Lagrange multipliers to find the maximum and minimum values off(x,y) = x on the curve defined by
2.(30 points)
(i) Convert the following equations in Cartesian coordinates to spherical coordinates:
(ii) Convert the following equations in Cartesian coordinates to cylindrical coordinates:
3.(30 points) Consider the map defined by
(u,v) = F(x,y) = (y + xy,y - xy).
(i) (10 points) Show that F has an inverse map by finding F-1 explicitly.
(ii) (10 points) Find the derivative matrices DF(x,y) and DF-1 (u,v) and verify that DF(x,y)DF-1 (u,v) = I.
(iii) (10 points) Verify that the Jacobians satisfy
4.(10 points) Miscellaneous problems.
(i) (5 points) Find the local maximum and minimum of the function f(x,y) = (1+ ey ) cos x -yey and the corresponding critical points.
(ii) (5 points) Suppose f(x,y), g(x,y) are two functions with continuous partial derivatives. Show that if for any (x,y) ∈ R2 we have
then the number of solutions of in the region {(x,y) ∈ R2 : 0 ≤ x ≤ 100, 0 ≤ y ≤ 50} is finite.
(Hint: Use the Inverse Mapping Theorem. )
(Additional hint: if the region {(x,y) ∈ R2 : 0 ≤ x ≤ 100, 0 ≤ y ≤ 50} is covered by infinitely many neighbors {Oi : i ∈ I}, III = +∞, then there are finitely many neighbors {Oi : i ∈ J ≤ I}, IJI < +∞ covering the above region. )